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板材局部体积成形技术,或称为板材热冲锻成形技术,为近年来提出的一种板材零件成形方法,其特点是板材冲压成形时不但完成板材零件形状的成形,还兼有局部结构的体积成形,例如局部凸柱、凸台、凸筋等结构的成形,适合于成形镁合金、铝合金等金属的成形,尤其适于替代一些电子器件外壳的铸造加工产品。文章介绍了板材热冲锻成形技术的原理、主要工艺控制参数,并对镁合金盒形件的热冲锻成形过程进行了实验研究和计算机模拟分析。针对带有螺丝柱的典型AZ31B镁合金方盒件,通过实验和有限元模拟,研究了其热冲锻成形工艺。实验表明,在再结晶温度以上冲锻2mm或3mm厚的镁合金板材有很好的成形能力,盒形件的周边和内部凸柱都能同时成形。研究结果表明,合理的模具结构、摩擦润滑条件和加热温度等参数,可以获得侧壁高度均匀、凸柱高度合适、无吸孔和凸柱断裂等缺陷的工件。
Plate partial volume forming technology, or plate hot forging forming technology, is proposed in recent years, a sheet metal forming method, which is characterized by sheet metal stamping forming not only to complete the shape of the sheet metal parts, but also both the volume of the local structure Forming, such as partial lugs, bosses, ribs and other structures, is suitable for the forming of metal such as magnesium alloy and aluminum alloy. It is especially suitable for casting products of some electronic devices. This paper introduces the principle of hot stamping forming technology and the main process control parameters. The hot stamping forming process of magnesium alloy box is carried out experimentally and computer simulation analysis. Aiming at the typical AZ31B magnesium alloy square box with screw column, the hot stamping forming process was studied through the experiment and finite element simulation. Experiments show that forging above the recrystallization temperature forging 2mm or 3mm thick magnesium alloy sheet has a good ability to form the box around the internal and internal columns can be formed at the same time. The results show that the reasonable workpiece structure such as the structure of the mold, the conditions of friction and lubrication and the heating temperature can obtain the workpiece with the uniform height of side wall, the height of the convex column and no defects of the suction hole and the convex column.